CN101125733A - Method of manufacturing optical fiber - Google Patents

Method of manufacturing optical fiber Download PDF

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Publication number
CN101125733A
CN101125733A CN 200710142414 CN200710142414A CN101125733A CN 101125733 A CN101125733 A CN 101125733A CN 200710142414 CN200710142414 CN 200710142414 CN 200710142414 A CN200710142414 A CN 200710142414A CN 101125733 A CN101125733 A CN 101125733A
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CN
China
Prior art keywords
mentioned
glass tubing
optical fiber
plug
sleeve pipe
Prior art date
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Granted
Application number
CN 200710142414
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Chinese (zh)
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CN101125733B (en
Inventor
森平英也
上原正光
神谷保
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Filing date
Publication date
Priority claimed from JP2002199163A external-priority patent/JP4297320B2/en
Priority claimed from JP2002199164A external-priority patent/JP2004043199A/en
Priority claimed from JP2002199165A external-priority patent/JP2004043200A/en
Priority claimed from JP2002199166A external-priority patent/JP2004043201A/en
Application filed by Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Publication of CN101125733A publication Critical patent/CN101125733A/en
Application granted granted Critical
Publication of CN101125733B publication Critical patent/CN101125733B/en
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/01251—Reshaping the ends
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C03B37/02754—Solid fibres drawn from hollow preforms
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/08—Sub-atmospheric pressure applied, e.g. vacuum
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/47—Shaping the preform draw bulb before or during drawing

Abstract

A method of manufacturing an optical fiber, characterized by comprising the steps of forming a glass body having a core, forming a glass tube constituting a clad portion, inserting the glass body into the glass tube, forming the glass body integrally with the glass tube, finishing at least the extraction side end part of the glass tube in a tapered shape and washing the outer surface of the glass tube, characterized in that a difference between the outer diameter of the glass body and the inner diameter of the glass tube is 1.0 to 10.0 mm, and the inner diameter of a support tube fitted to one end of the glass tube is increased more than that of the glass tube or the extraction side end part of the glass tube is sealed with a tapered part provided at least on the inner surface thereof and a spacer is installed so that a clearance between the outer diameter of the glass body and the inner diameter of the glass tube becomes generally constant in the longitudinal direction.

Description

Optical fiber manufacturing method
It is May 8, China national application number in 2003 the dividing an application for the patent application of " optical fiber manufacturing method " that be 03800920.X, denomination of invention that this case is based on international filing date.
Technical field
The invention relates to optical fiber manufacturing method, more detailed saying is manufacture method about optical fiber communication.
Background technology
Optical fiber is as basic material with silica glass.Generally be synthetic in advance fertile material (preform) with regulation index distribution, again that its fusion in process furnace is softening, draw the formation filament.As the synthetic method of fertile material, what proposed has MCVD method, VAD method, an OVD method etc.
For example, people are known, as Fig. 6 a) shown in, form the vitreum contain core (below be called plug) at centre portions, as the plug made from these method for makings (Fig. 6 has represented the situation of VAD method) 61,, prepare to use the sleeve pipe 62 of Glass tubing as the coating layer part.They are fixed (maintenance) with plug support stick 64 and collar supports pipe 63 and live, as Fig. 6 b) shown in, add thermosetting one individuation and as the method for fertile material.Also know incorporate fertile material and wire drawing are implemented simultaneously.
The process furnace of drawing wire machine uses the electric furnace that reaches more than 2000 ℃ usually.Fertile material is inserted in the stove,, carry out spinning by drawing with its end heating and melting.When spinning reaches steady state, form being shaped as of fertile material front end, wait definite lune to stablize according to the temperature distribution, the drawing speed that form by well heater in fertile material external diameter or viscosity, the process furnace, the characteristic of gained fiber is also stablized.When integrated and wire drawing are carried out simultaneously, for example can utilize the gap between vacuum pump suction sleeve pipe and the insertion plug, reduce pressure, in the lune part, it is integrated by heating core material and pipe to be carried out, and draws the formation filament again.At this moment, when above-mentioned plug is inserted the hollow space of coating layer part, for example can use the method shown in Figure 28.That is, the plug 353 that is processed into intended size is fixed on the holding tray that can vertically work with sleeve pipe 351, plug 353 is slowly descended along the direction of arrow among Figure 28, and insert in the hollow space of sleeve pipe 351.
Yet after wire drawing began, the end shape of fertile material can be different with wire drawing, and it is stable that spinning does not reach, and in order to improve this situation, proposed in advance the end to be carried out the scheme (spy opens flat 7-330362, the spy opens flat 8-310825) of pre-treatment processing.Can reduce to begin the back bad phenomenon that fiber yarn directly changes and characteristic changes thus, thereby reach the operation effectuation.
Yet, cone shape is processed in the end, though can reach above-mentioned effect,, behind synthetic fertile material, carry out end processing, do out of tradely except former, also to increase other processing, thereby increase the number in man-hour that never has.In case working method is inappropriate, can produce the danger that damages fertile material in the processing.
And then, because of also there is the danger of polluting fertile material in processing, and become the reason that causes fibre strength bad.
When making bigger fertile material, processing unit (plant) and other devices also can become quite huge.Not only operation is poor, and the expense of setting device is also very big.
In addition, there are foreign material such as particulate and oil content sometimes in the operating environment when making optical fiber.These foreign material equally also can remain on the optical fiber surface attached to forming surface contamination on the sleeve pipe.As a result, stress can form concentrated in this part, and has weakened the intensity of optical fiber.For this reason, before wire drawing, need cannula cleaning etc., to remove foreign material.
Though clean above-mentioned sleeve pipe various methodologies is arranged, use damp process usually, flow with scavenging solution and clean.As scavenging solution, can use the fluoric acid aqueous solution or surfactant soln with corrosive effect.Surface cleaning can be made by cleaning, thereby the reliability of fiber strength can be improved.
Yet, in tank, fill with scavenging solution, sleeve pipe is immersed wherein, take out subsequently, move in the pure water groove and clean, when using this washing out method, scavenging solution can enter the telescopic hollow space.Hollow space does not reach effectively and cleans, but also can the residual mark of washing.When using the fluoric acid aqueous solution, produce slight scar (pit) sometimes.
When under the contaminated state of sleeve pipe hollow space, perhaps under the surface irregularity state, when forming optical fiber, external diameter meeting change can not get fine optical fiber in wire-drawing process.Because this change produces fracture sometimes in wire-drawing process.Also become the insufficient reason of fiber strength.These bad phenomenon, after cleaning, if hollow space is implemented to purify or planarization, though can prevent, but increased new number in man-hour, cause production efficiency to reduce.And after hollow space inserted plug, these operations also were difficult to implement.
Therefore, the purpose of this invention is to provide the manufacture method of a kind of optical fiber with fertile material, when making optical fiber, fertile material is placed wire-drawing frame, with its end fusion, when stretch forming fiber, can shorten from wire-drawing operation and begin to stable, to produce the length of bad fiber and the time loss between this.And then the purpose of this invention is to provide the treatment process of a kind of optical fiber with fertile material, make the fiber that draws wire have enough intensity.
Disclosure of an invention
The 1st kind of form of optical fiber manufacturing method of the present invention is characterized in that comprising following operation: form the operation that contains the core glass body; Prepare to constitute the operation of coating layer segment glass pipe; Be processed into the operation of cone shape to the outlet side end of the above-mentioned Glass tubing of major general; Above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting.
The 2nd kind of form of methods for optical fiber manufacture of the present invention is characterized in that cone shape that the outlet side end of above-mentioned Glass tubing is processed into, the lune shape that forms when being similar to drawing optical fibers.
The 3rd kind of form of methods for optical fiber manufacture of the present invention, it is characterized in that above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting, it is integrated to be that end with above-mentioned vitreum and Glass tubing adds thermosetting, after the sealing, reduced pressure in Glass tubing inside on one side, the while drawing optical fiber continues to add the incorporate operation of thermosetting to vitreum and Glass tubing on one side.
The 4th kind of form of methods for optical fiber manufacture of the present invention, the operation that it is characterized in that being processed into to an end of major general's Glass tubing cone shape is the mechanical mill operation, after above-mentioned mechanical mill operation, also comprises the operation of cleaning means of abrasion.
The 5th kind of form of methods for optical fiber manufacture of the present invention, the operation that it is characterized in that being processed into to an end of major general's Glass tubing cone shape is the mechanical mill operation, after above-mentioned mechanical mill operation, also comprise the operation of cleaning means of abrasion and means of abrasion is carried out step of polishing.
The 6th kind of form of methods for optical fiber manufacture of the present invention, it is characterized in that also comprising the operation that the vitreum outlet side end of containing above-mentioned core is processed into cone shape, above-mentioned vitreum and the heating of above-mentioned Glass tubing are being begun to form the incorporate moment, the cone shape part of above-mentioned Vitrea cone shape part and above-mentioned Glass tubing forms on the roughly same position of length direction.
The 7th kind of form of methods for optical fiber manufacture of the present invention is characterized in that above-mentioned Glass tubing heating and melting, with the end of outlet side pull out attenuate after, and the end end operation of sealing this outlet side end.
The 8th kind of form of methods for optical fiber manufacture of the present invention, it is characterized in that also comprising the operation that the outlet side end that contains the core glass body is processed into cone shape, above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing, be that above-mentioned vitreum is connected above-mentioned Glass tubing, make above-mentioned Vitrea cone begin part and form roughly consistent operation with the lengthwise position at above-mentioned glass pipe end end.
The 9th kind of form of methods for optical fiber manufacture of the present invention is characterized in that comprising following operation: form the operation that contains the core glass body; Prepare to constitute the operation of coating layer Glass tubing partly; Clean the operation of above-mentioned glass tube exterior surface; With the operation in the above-mentioned vitreum insertion Glass tubing; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting.
The 10th kind of form of methods for optical fiber manufacture of the present invention is characterized in that also comprising the operation that the outlet side end of above-mentioned Glass tubing is sealed; With the operation of supporting tube being installed in the end side of above-mentioned Glass tubing, the operation of above-mentioned cleaning glass tube exterior surface is above-mentioned supporting tube to be clogged and the operation of washing.
The 11st kind of form of methods for optical fiber manufacture of the present invention is characterized in that also comprising the operation that the outlet side end of above-mentioned Glass tubing is sealed; With the operation of supporting tube being installed in the end side of above-mentioned Glass tubing, clean the operation of above-mentioned glass tube exterior surface, after in the above-mentioned vitreum insertion Glass tubing, clog the operation that above-mentioned supporting tube washs.
The 12nd kind of form of methods for optical fiber manufacture of the present invention is characterized in that comprising following operation: form the operation that contains the core glass body; Prepare to constitute the operation of coating layer segment glass pipe; Clean first matting of above-mentioned glass tube exterior surface; After above-mentioned first cleaning, cover the outside surface operation of above-mentioned Glass tubing with packing film (wrap); With behind the packing film covering process, above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; After inserting operation, remove the operation of above-mentioned packing film; After removing packing film, clog the open portion of above-mentioned Glass tubing, clean second matting of above-mentioned glass tube exterior surface and above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting.
The 13rd kind of form of methods for optical fiber manufacture of the present invention is characterized in that above-mentioned matting, uses the fluoric acid aqueous solution of 1-20wt%, after the hydrogen fluoride water treatment, clean with clear water again, and dry.
The 14th kind of form of methods for optical fiber manufacture of the present invention is characterized in that above-mentioned matting comprises the operation of using the pure water of specific conductivity below 1 μ A to carry out rinsing.
The 15th kind of form of methods for optical fiber manufacture of the present invention is characterized in that comprising following operation: form the operation that contains the core glass body; Prepare to constitute the operation of coating layer segment glass pipe; With the operation in the above-mentioned vitreum insertion Glass tubing; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting, poor (dp-D1) of the internal diameter (dp) of above-mentioned Vitrea external diameter (D1) and above-mentioned Glass tubing is more than 1.0mm, below the 10.0mm.
The 16th kind of form of methods for optical fiber manufacture of the present invention, it is characterized in that also comprising the operation that supporting tube is installed in above-mentioned Glass tubing one end, poor (ds-D1) of the internal diameter (ds) of above-mentioned Vitrea external diameter (D1) and above-mentioned Glass tubing is more than 1.0mm, 10.0mm below, poor (db-D1) of the internal diameter (db) of above-mentioned Vitrea external diameter (D1) and above-mentioned Glass tubing and above-mentioned supporting tube mounting portion is more than 1.0mm, below the 10.0mm.
The 17th kind of form of methods for optical fiber manufacture of the present invention is characterized in that also comprising the operation that supporting tube is installed in above-mentioned Glass tubing one end that the material of above-mentioned supporting tube is a natural quartz.
The 18th kind of form of methods for optical fiber manufacture of the present invention is characterized in that comprising following operation: form the operation that contains the core glass body; Prepare to constitute the operation of coating layer segment glass pipe; Supporting tube is installed in the operation of above-mentioned Glass tubing one end; Above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting, the internal diameter (dp) of internal diameter of above-mentioned supporting tube (ds) and above-mentioned Glass tubing is ds 〉=dp.
The 19th kind of form of methods for optical fiber manufacture of the present invention is characterized in that the external diameter (Ds) of above-mentioned supporting tube and the external diameter (Dp) of above-mentioned Glass tubing, is Ds 〉=Dp.
The 20th kind of form of methods for optical fiber manufacture of the present invention is characterized in that supporting tube is installed in the operation of above-mentioned Glass tubing one end, is by deposited fixing, and then comprises that external diameter with deposited part is shaped to the operation below the above-mentioned supporting tube external diameter.
The 21st kind of form of methods for optical fiber manufacture of the present invention, the material that it is characterized in that above-mentioned supporting tube is a natural quartz.
The 22nd kind of form of methods for optical fiber manufacture of the present invention is characterized in that comprising following operation: form the operation that contains the core glass body; Prepare to constitute the operation of coating layer segment glass pipe; At least on inner face, be provided with cone-shaped, the operation of sealing above-mentioned Glass tubing outlet side end; Above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; Between the internal diameter of above-mentioned Vitrea external diameter and Glass tubing, spacer is set, to form the operation of certain interval; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting.
The 23rd kind of form of methods for optical fiber manufacture of the present invention is characterized in that also being included in the operation that supporting tube is installed with the end of above-mentioned Glass tubing outlet side opposition side; With in the operation of support stick being installed with the end of above-mentioned Glass tubing outlet side opposition side, above-mentioned spacer is arranged between the internal diameter of the external diameter of above-mentioned support stick and above-mentioned supporting tube in the gap.
The 24th kind of form of methods for optical fiber manufacture of the present invention, it is characterized in that outlet side is transferred core, make above-mentioned Vitrea end touch the cone that is located at the Glass tubing inner face, use above-mentioned spacer pair and outlet side opposition side to transfer core, make above-mentioned vitreum and above-mentioned Glass tubing form the configuration of concentric circles ground.
The 25th kind of form of methods for optical fiber manufacture of the present invention is characterized in that being provided with the operation of above-mentioned spacer, is carrying out after the operation of above-mentioned vitreum being inserted in the Glass tubing.
The 26th kind of form of methods for optical fiber manufacture of the present invention is characterized in that also comprising with concentric circles support stick is installed in operation with above-mentioned vitreum outlet side opposition side end; With with concentric circles supporting tube is installed in operation with above-mentioned Glass tubing outlet side opposition side end.
The 27th kind of form of methods for optical fiber manufacture of the present invention, it is characterized in that also comprising following operation: support stick is installed in operation with above-mentioned vitreum outlet side opposition side end with concentric circles, with with concentric(al) circles supporting tube is installed in operation with above-mentioned Glass tubing outlet side opposition side end, above-mentioned support stick has the part of being connected and fixed, to be connected and fixed above-mentioned spacer.
The 28th kind of form of methods for optical fiber manufacture of the present invention, the material that it is characterized in that above-mentioned spacer are quartzy.
The 29th kind of form of methods for optical fiber manufacture of the present invention, the profile that it is characterized in that above-mentioned spacer be for circular, forms chimeric with the internal diameter of above-mentioned Glass tubing, the center has can insert above-mentioned Vitrea opening portion, and have aspirating hole, during wire drawing, can make above-mentioned Glass tubing inner pressure relief.
The 30th kind of form of methods for optical fiber manufacture of the present invention, the profile that it is characterized in that above-mentioned spacer is for circular, form chimeric with the internal diameter of above-mentioned Glass tubing, the center has can insert above-mentioned Vitrea opening portion, has a plurality of slit-shaped aspirating holes with radial setting around this opening portion.
The 31st kind of form of methods for optical fiber manufacture of the present invention, the profile that it is characterized in that above-mentioned spacer is for circular, forms chimericly with the internal diameter of above-mentioned Glass tubing, and the center has the aspirating hole that is formed by a plurality of apertures, can when wire drawing, be reduced pressure in above-mentioned Glass tubing inside.
The 32nd kind of form of methods for optical fiber manufacture of the present invention is characterized in that also comprising the operation that above-mentioned Vitrea outlet side end is processed into cone shape, and the cone that is located on the above-mentioned vitreum is more precipitous than above-mentioned Glass tubing inner face cone face.
The 33rd kind of form of methods for optical fiber manufacture of the present invention is characterized in that comprising following operation:
Formation contains the operation of core glass body; Prepare to constitute the operation of coating layer Glass tubing partly; Be processed into the operation of cone shape to the outlet side end of the above-mentioned Glass tubing of major general; Above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; With above-mentioned vitreum and Glass tubing are added the integrated operation of thermosetting, and then the optical fiber that makes transmission loss under the 1385nm wavelength is 0.4dB/km or below it.
The 34th kind of form of methods for optical fiber manufacture of the present invention is characterized in that and then above-mentioned Glass tubing is formed by the synthetic quartz of OH base concentration below 100ppm.
Description of drawings
Fig. 1 is an explanatory view of representing the end shape of the wire drawing fertile material among one of the present invention embodiment with sectional view.
Fig. 2 is the explanatory view that utilizes VAD manufactured core cigarette ash (soot) method.
Fig. 3 is that the front end face of one of the present invention of representing with sectional view embodiment is cut the explanatory view of operation outward.
Fig. 4 is the explanatory view of the sleeve pipe operation of one of the present invention of representing with sectional view embodiment.
Fig. 5 is the explanatory view of the cone-shaped grinding blind rod of insertion of one of the present invention of representing with sectional view embodiment.
Fig. 6 is the relevant prior art of representing with sectional view, a) the deposited preceding state description figure of plug and sleeve pipe, the b) explanatory view of the shape example after fertile material and being integral of sleeve-shaped.
Fig. 7 is the sleeve pipe among the embodiment 1 that represents with sectional view and the explanatory view of fertile material change of shape, Fig. 7 (a) be expression form integrated before the explanatory view of fertile material and sleeve-shaped, Fig. 7 (b) is the explanatory view of expression fertile material and the sleeve-shaped shape after in aggregates.
Fig. 8 be with sectional view represent at the plug of implementing embodiment 2 front and back and the variation explanatory view of sleeve-shaped, Fig. 8 (a) is expression plug and the sleeve pipe state description figure before deposited, Fig. 8 (b) is the fertile material shape explanatory view of expression after deposited.
Fig. 9 is the plug of enforcement embodiment 3 front and back represented with sectional view and the variation explanatory view of sleeve-shaped, and Fig. 9 (a) is the state description figure before expression plug and sleeve pipe are melting, and Fig. 9 (b) is the explanatory view of the deposited stepmother's shape of expression.
Figure 10 is the plug of enforcement embodiment 4 front and back represented with sectional view and the variation explanatory view of sleeve-shaped, Figure 10 (a) is the state description figure before expression plug and sleeve pipe are melting, Figure 10 (b) is the explanatory view that the rear sleeve shape is being melted in the expression end, the figure of the state when Figure 10 (c) is the expression wire drawing.
Figure 11 is the concise and to the point figure of VAD method.
Figure 12 is the fertile material sectional dimension ratio of one of the present invention embodiment.
Figure 13 has the sleeve pipe that clogs supporting tube briefly to scheme.
Figure 14 is the telescopic matting.
Figure 15 is the plug situation is inserted in expression in sleeve pipe figure.
Figure 16 is the figure of housing on the telescopic supporting tube.
Figure 17 is inserted in concise and to the point figure in the sleeve pipe with plug.
Figure 18 is expression plug external diameter and the difference of casing inner diameter and the graph of a relation of offset.
Figure 19 is the synoptic diagram when plug is inserted sleeve pipe.
Figure 20 is inserted in synoptic diagram in the sleeve pipe with plug.
Figure 21 is the figure that expression is inserted in plug one of the present invention in the sleeve pipe true mode.
Figure 22 is the figure that expression is inserted in plug another the true mode of the present invention in the sleeve pipe.
Figure 23 is the sketch that expression is inserted in plug the early stage technology in the sleeve pipe.
Figure 24 is the sketch that one of the present invention in sleeve pipe embodiment form is inserted plug in expression.
Figure 25 is the sketch that one of the present invention in sleeve pipe embodiment form is inserted plug in expression.
Figure 26 is that expression is inserted plug, inserted the synoptic diagram of one of the present invention embodiment of spacer in the synthetic quartz pipe.
Figure 27 is expression spacer example of shape figure.
Figure 28 utilizes prior art to insert the synoptic diagram of plug in sleeve pipe.
Figure 29 is the explanatory view of the deposited preceding state of other plug and sleeve pipe of expression.
Implement best mode of the present invention
Manufacture method of the present invention, not the end shape when the synthetic fertile material is processed into the beginning wire drawing, but synthesize when making fertile material, be pre-formed the ideal end shape, can save the operation that is accompanied by end processing, meanwhile can suppress bad phenomenon and take place and cost saving.
Below as required, describe with reference to the accompanying drawings, but accompanying drawing is an example of optimal morphology of the present invention, the present invention is not limited to this.
Usually, wire-drawing frame is arranged perpendicular stove, resin-coating device, resin solidification device, drawing wire machine.In stove with glass melting, by the drawing wire machine continuous drawing.During beginning, owing to must pull out glass,, heat up, make the end softening, prevent and to come off because of gravity so fertile material is packed in the stove.
For this reason, as shown in Figure 1, it is coniform that the top of fertile material is dwindled into, and the shape with weight is paid in its end.
In addition, the end shape 12 (cone shape) of fertile material, the lune 11 that forms in the time of can being similar to wire drawing (for reference to also remembering), this benefits, and the cone-shaped grinding of carrying out among the present invention can form similar this semi-moon shaped shape.
As the feature of fertile material manufacture method of the present invention, selected the method for two-stage enforcement.Thus, the vitreum that contains core glass body and whole coating layer part is made separately respectively, so even carry out end processing in the operation of paying the coating layer part, implement separately, when core is synthetic, suitably adjust refractive index curve, can obtain good fiber properties, production performance can not worsen yet.
Vitreum as above-mentioned whole coating layer part for example has synthetic quartz.As the layer that this whole coating layer part is formed by vitreum, pay the method that contains on the core glass body, can adopt following two kinds of methods, promptly, to contain the core glass body inserts in the Glass tubing interior (for example silica tube), the method (the note work 2 down) that adds the incorporate tiretube process of thermosetting (down note do 1) and should integral body implement simultaneously with wire drawing.Any method can both be paid bar-shaped Vitrea outside with constituting the coating layer part by the layer that vitreum forms.
1) tiretube process
Usually, the Glass tubing that uses in the sleeve pipe (the following sleeve pipe that also claims), for example silica tube, the blank of hollow is processed into tubulose,, cuts two ends with cutting knife with its elongation, obtain desired length, when in use empty blank pipe or stretching tube, normally two ends are formed round shape.Bar-shaped plug is inserted in it, and being collapsed by indirect heating forms integratedly, and as a result of, the end of significant part forms sharp-pointed round shape.Again it is stretched while heating with burner, carry out flame machining, perhaps stretch, carry out stove processing, after above-mentioned wire drawing begins, so-called wire drawing problem of unstable can take place with the electric furnace heating.
2) form incorporate method simultaneously with wire drawing
Usually, forming simultaneously in the incorporate method with wire drawing, employed sleeve pipe, also with above-mentioned the same, both ends form sharp-pointed cylindric, also exist and above-mentioned the same problem.Forming simultaneously in the incorporate method with wire drawing, in addition, for inner pressure relief, the end of pipe will be sealed.After inserting plug in the sleeve pipe, will manage heat shrink, when using deposited method, be difficult to effectively the end be processed cone-shaped.
The present invention just forms incorporate method simultaneously applicable to above-mentioned tiretube process and/or with wire drawing.
Among the present invention, before sleeve pipe, that the outside, the end formation of pipe is cone-shaped.The processing of cone can be adopted mechanical mill.Can be processed into cone-shaped thus effectively.
When mechanical mill, abrasive substance and glass powder can be attached on the fertile material surfaces, when forming fiber later on, because the external diameter of this part can produce change, or think that intensity do not move, so preferably means of abrasion is cleaned.Make the processing part form slick surface, after wire drawing began, the external diameter of fiber can reach stable soon, so be ideal.
As another kind of method, in advance pyramidal sleeve pipe being processed in the outlet side end, heat extension, during contraction, form the cone-shaped of elongation, closed operation and cone processing also can be carried out simultaneously, are effectively.Especially use the middle portion of heating long tube, slowly during the tensile method, once can process 2 pipes, very effective, so be ideal.
In addition,, form cone-shapedly by heat shrink, be equivalent to the plug end of this part even in any situation, but the shape that preprocess becomes to attenuate towards the end, then with the situation of not processing relatively, the silk footpath can reach stable quickly, so be ideal.This is because the ratio of core and coating layer part approaches the value of parallel portion.Ideal situation, the ratio that preferably makes core and coating layer part whole be processed into semi-moon shaped part form constant, but with the end of plug grind be similar to coniform also effective.The most effectively beginning the place near cone, need to strengthen this being similar to, its reason is in fact to obtain fiber in the outlet part, is just begun to obtain by this vicinity.
As shown in figure 29, when the telescopic conical part separated in the vertical with the conical part of plug, the excessive clearance of the conical part of plug and sleeve pipe inner face sometimes can not be deposited well.This situation as shown in Figure 8, begins to form the incorporate moment at sleeve pipe and plug, and the cone shape of plug and telescopic cone shape are preferably in longitudinally roughly same position formation, can prevent to form excessive gap like this.
In addition,, be consistent substantially in the vertical, shown in Fig. 9 (a), also can use holding member as sleeve closure rod 95 1 classes in order to make plug and telescopic conical part position.
And then, the present invention is an optical fibre mother body cleaning of materials method, it is characterized in that forming plug, this plug is inserted in the sleeve pipe hollow space of making separately, heat its end, make plug and being integral of sleeve-shaped on one side, carry out wire drawing on one side, when making optical fiber, be fabricated onto between the wire drawing from above-mentioned telescopic with this, only, once above matting is set at above-mentioned telescopic outside surface.
According to the present invention, fertile material is placed wire-drawing frame, its end of fusion, when being drawn into optical fiber, resulting optical fiber can keep good dimensional characteristic and intensity.That is, clean fertile material, after the wire drawing, can obtain good fiber strength.
Core segment and coating layer part is when carrying out wire drawing and still keep separating, if scavenging solution immerses in the gap, the change of optical fiber external diameter can not get fine optical fiber when just causing wire drawing.Therefore, during washing, it is clogged, make scavenging solution can not immerse hollow space.Foreign material are sneaked in the hollow space of silica tube in can preventing to operate according to the present invention, and produce bad phenomenon.
Among the present invention, close telescopic one end, behind the quartz system supporting tube that deposited aforesaid operations is used on the other end, clog this quartz system supporting tube, when cleaning above-mentioned telescopic hollow space, can not immerse scavenging solution.
For example, when being open state, only clean outside surface, can not use the method for flooding in the scavenging solution at two ends.Because apply scavenging solution from the outside, the drop that splashes might enter inside.One end of sealed tube vertically is provided with pipe, is dipped into the cleaning position that needs in scavenging solution, might prevent liquid dipping tube inside, but must control liquid level well, and scavenging solution is not overflowed in the pipe.So long as all can there be above-mentioned same problem in the method for applicating liquid.
If clog open portion with stopper in advance, it is inner to prevent briefly that liquid from immersing, and the processing of pipe also is easy to, and it is inner to prevent that other foreign material from sneaking into pipe.
That is, as shown in figure 13, do not seal at gained sleeve pipe 231 one distolateral, the deposited supporting tube 233 of quartzy system.The shape of supporting tube 233, when for example erecting on the chuck of rotation, basically level and smooth, can not produce unnecessary crookedly, external diameter change longitudinally is little, preferably ± and the silica tube of 1mm/1m, also to have and consider to be connected with vacuum pump, or the end surface shape of installing to fiber drawing furnace, size preferably has and the roughly the same external diameter of cover external diameter of pipe.And has a internal diameter greater than casing inner diameter.At the opening portion of supporting tube 233, with stopper 235, for example the stopper 235 of silicon rubber system clogs.
Shown in Figure 14 (a), supporting tube 233 openings are plugged with the sleeve pipe 231 of stopper 235, dipping in the groove 243 that fills with the fluoric acid aqueous solution 241.Then shown in Figure 14 (b), transfer in the groove 247 that fills pure water 245, slightly wash.Then, shown in Figure 14 (c), use spray pure water 249 to clean, blow away water droplet with pressurized air after, carry out air-dry.
In the present embodiment, only clean outside surface, make the open end of cover 231 be plugged with stopper 235, so scavenging solution can not enter inside.Thereby improved the reliability of fibre strength, and in wire-drawing process, can suppress the generation of bad phenomenon.
Among the present invention, during cleaning, use the hydrofluoric acid aqueous solution of 1-20wt%, after handling with above-mentioned hydrofluoric acid aqueous solution, use pure water drip washing again, drying.During light contamination, only clean and also can obtain effect with pure water.
The pure water that uses in the matting for example, preferably uses the ion exchange method purified, and specific conductivity remains on the following pure water of 1 μ A.
Among the present invention, after the cleaning, above-mentioned telescopic outside surface coats with protective membrane, under this state, plug is inserted in the telescopic hollow space, removes protective membrane, clogs with stopper, cleans once more, makes scavenging solution can not immerse above-mentioned telescopic hollow space.That is, after the cleaning, new surface can form light contamination, so envelope sleeve surface with protective membrane, in inserting operations such as plug and conveying, can prevent contaminated.
Yet, also might pollute attached to the foreign matter on the protective membrane etc., but in wire-drawing process, require surperficial based on very high purity, so clean once more before being preferably in wire drawing and beginning.
And then, among the present invention, telescopic one end is sealed, behind the quartz system supporting tube of deposited processing usefulness on the other end, plug is inserted in the above-mentioned telescopic hollow space, after the insertion, clog above-mentioned quartzy supporting tube, clean, make scavenging solution can not immerse the telescopic hollow space.
For example, shown in Figure 15, support stick 253 is installed on plug 251 1 ends that are processed into intended size.The support stick 253 usefulness clamps 255 of plug 251 are fixed on the rotating disk that can make vertically-acting.The supporting tube 233 usefulness clamps 257 of sleeve pipe 231 are fixed.Like this, plug 251 is slowly fallen by the direction of arrow among Figure 15, inserts in the opening portion of sleeve pipe 231.
Then, for example shown in Figure 16, the sleeve pipe 231 that is inserted with plug 251 is unloaded from rotating disk, cover the insertion end of supporting tube 233 with cover 259.Then, as previously mentioned, in hydrofluoric acid aqueous solution, flood.Then transfer in the groove that fills pure water, slightly wash, clean with the spray pure water at last, blow away water droplet with pressurized air after, air-dry.When inserting operation, thinking that tube-surface does not have under the situation of significantly pollution, also can only carry out pure water spray and dry.
After the cleaning, new surface might produce light contamination, so envelope the telescopic surface with protective membrane, in inserting operations such as plug and conveying, can prevent to pollute once more.Yet, attached to the foreign matter on the protective membrane etc., might form pollution, and in wire-drawing process, the clarity on surface is required high, so before wire drawing begins, preferably clean once more.
Among the present invention, the cleaning way shown in Figure 13, the cleaning way shown in Figure 16 can be distinguished separately and implement, and can certainly implement the mode of Figure 16 again after the mode of Figure 13.
And then, optical fibre mother body material manufacturing method of the present invention, it is characterized in that forming plug, and this plug is inserted in the sleeve pipe hollow space of making separately, heat its end, make plug and being integral of sleeve-shaped, carry out wire drawing simultaneously, when so making optical fiber, above-mentioned plug is inserted in the above-mentioned sleeve pipe, make the poor of the external diameter of plug and telescopic internal diameter, be 1.0-10.0mm.
According to the present invention, when making optical fiber, make plug, and then use the sleeve pipe that is equivalent to the coating layer part, when they are added the thermosetting one, implement wire drawing simultaneously, at this moment can be suppressed at when plug inserted in the sleeve pipe operation and produce damage and cause qualification rate to reduce.
According to the present invention, be taken as 1.0-10.0mm by difference with plug external diameter and casing inner diameter, in inserting operation, can reduce the friction of mandrel material outside surface and internal surface of sleeve pipe and the generation damage.And can be suppressed at fibrosis the time, core produces eccentric.
Sketch when as mentioned above, having represented among Figure 15 to insert plug in the sleeve pipe.Arrow is a direction of insertion among the figure.Sleeve pipe is inboard to keep level and smooth, can not adhere to foreign material on the surface.Sleeve pipe is arranged on the rotating disk of processed glass, uses oxygen/hydrogen flame heating, seal an end, the supporting tube of deposited quartzy system on a untight end.
In addition, the present invention uses the end heating and melting of oxygen/hydrogen flame with sleeve pipe and supporting tube, the end of while extrusion molten, be deposited over each other together, shaping is carried out in inboard to deposited part, for example use trowel to carry out this shaping, make the external diameter of plug and the difference of telescopic internal diameter form 1.0-10.0mm.
That is, use the end of oxygen/hydrogen flame heating sleeve pipe and supporting tube, and push two deposited connections of terminal formation, and then the inboard trowel that uses of deposited part is carried out shaping, preferably make the difference of plug external diameter and casing inner diameter form 1.0-10.0mm.By this shaping, when inserting plug in the sleeve pipe, can reduce because of rubbing mutually and cause damage.
Among the present invention, as the material of supporting tube, preferably natural quartz.By using natural quartz, can reduce manufacturing cost.
Expression as the above-mentioned state that plug 335 is inserted sleeve pipe 331 among Figure 17.In order to obtain the specific fibre characteristic, according to the index distribution characteristic of plug, the external diameter and the internal diameter ratio of regulation sleeve pipe 331.
During insertion, sleeve pipe 331 and plug 335 bend or when tilting, plug 335 might abrade internal surface of sleeve pipe.The gap is more little, and perhaps plug and sleeve pipe are long more, and it is dangerous to increase this scratch more.In order to reduce this danger, plug and telescopic gap are preferably the scope of 1.0-10.0mm.
In order to ensure the gap of 1.0-10.0mm scope, preferably adjust plug and telescopic size in advance, so that the gap between plug and the sleeve pipe forms the size of regulation.
Among the present invention, when plug 335 being inserted in the hollow bulb of sleeve pipes 331, the difference in size of plug 341 external diameters and casing inner diameter 343 is taken as 1.0-10.0mm.
Expression changes poor (gap) of plug external diameter and casing inner diameter among Figure 18, tries to achieve the result of core core shift amount, and poor (gap) as can be known is big more, and core core shift amount is also big more.
The gap does not have effect less than 1mm, and scratch etc. can take place during insertion.Surpass 10mm even the gap is set, when forming fibrosis, core core shift amount also can be tending towards increasing, and is undesirable.When inserting the plug almost parallel in the sleeve pipe, gap size is in any parallel portion position-finding, as long as just do not hinder in numerical range.
And then, optical fibre mother body materials for support method of the present invention, it is characterized in that and to be inserted with optical fiber that the sleeve pipe of above-mentioned plug constitutes with fertile material end heating and melting by plug and hollow space, make above-mentioned plug and being integral of sleeve-shaped on one side, carry out wire drawing on one side, when making optical fiber, have the supporting tube of internal diameter, above-mentioned plug is inserted in the above-mentioned sleeve pipe greater than above-mentioned casing inner diameter in above-mentioned telescopic one end setting with this.
According to the present invention, when making optical fiber, with following method, promptly make the centre portions that contains plug, and then use the sleeve pipe that is equivalent to the coating layer part, it is integrated that they are added thermosetting, and, with stringy simultaneously, implement integratedly, can improve like this mandrel material is inserted operating efficiency in the sleeve pipe.And then, fertile material is placed in the wire-drawing frame, when being become fiber yarn, its end fusion draw can guarantee that the gained fiber has good fiber size characteristic.
For easy handling, supporting tube is installed on sleeve pipe, the internal diameter that makes supporting tube in inserting operation, when the mandrel outer surface contacts with internal surface of sleeve pipe, has and reduces dangerous effects such as producing damage like this greater than the desired internal diameter of sleeve pipe.Even the support stick that is installed on the plug is very short, clamping fixture can not produce deviation yet, and can exactly plug be inserted in the sleeve pipe.The result is an easy handling, and after the insertion, the support stick of plug can not fly out in managing.
During wire drawing, generally use carbon resistance furnace, when at high temperature sneaking into oxygen, can form burning with the reaction of stove material.Therefore, for preventing invading air, and feed rare gas element.Generally be, the cannula tip of wire drawing termination side with control the effective support section connection that is connected of cover.Yet the beginning portion that support section enters in the stove is outer when change is very big, and the interior pressure of stove also can drastic change.Thus, air-flow forms disorder, causes the heat distribution instability, and the external diameter of fiber also can produce change.
The invention is characterized in,, make sleeve pipe consistent with the external diameter of supporting tube for preventing this phenomenon.Even consistent with external diameter, during connection, wall portion also can swell, and the possible change of this section diameter is so preferably use flame machining, machining etc. to carry out shaping.
As subsidiary effect, the thickness attenuation of supporting tube can alleviate variable, also can reduce the expense of purchasing thus, also helps operation.If adopt the natural quartz material, can further reduction expense.Shorten the support stick size of plug, equally also have the effect of reduction expense.
Sketch when Figure 19 and Figure 20 represent that according to the present invention plug inserted silica tube.Arrow among Figure 19 is represented direction of insertion.Yet, in order to obtain the specific fibre characteristic, according to the index distribution characteristic of plug, the ratio of regulation cover external diameter of pipe and internal diameter.Usually, the external diameter of plug 435 is thinner than the internal diameter of sleeve pipe 431.
When inserting plug 435 in the sleeve pipe 431,, might can abrade internal surface of sleeve pipe by plug 435 if sleeve pipe 431 or plug 435 bend or tilt.Partition is more little, and plug 435 and sleeve pipe 431 are long more, increase abrasive possibility more.
Yet the internal diameter of supporting tube 432 is to not directly influence of fiber properties.For this reason, make the internal diameter of the internal diameter of supporting tube 432, in inserting operation, can reduce the danger that the mandrel outer surface contacts with internal surface of sleeve pipe greater than sleeve pipe 431.And then, be easy to operation, and can shorten the activity duration.
Owing to make the internal diameter of supporting tube 432 can be big, so clamping fixture 437 can be inserted into the support stick 436 of plug 435 inboard of supporting tube 432, because the plug 435 that can will contain support stick 436 is inserted into the inboard of sleeve pipe 431, so after inserting, the support stick 436 of plug can not withdraw from managing, and makes later operation become easy.
Make the outside dimension of supporting tube 432 identical with the outside dimension of sleeve pipe 431, or slightly little size.Thus, in fiber stringy termination side, supporting tube 432 enters the top part in the stove, can not scratch the air-flow in the random stove.Its result also can prevent the change of fiber external diameter.
Even the external diameter of sleeve pipe 431 is identical with the external diameter of supporting tube 432, during connection, wall portion also can swell, and causes this section diameter change.For this reason, after the connection, preferably bump is flattened.
In addition, by increasing the internal diameter of supporting tube 432, can reduce the wall thickness of supporting tube 432.Its result, owing to reduced the weight of supporting tube 432, thus reduced expense, and help operation.
In addition, of the present inventionly it is characterized in that the material of supporting tube is a natural quartz.If adopt the natural quartz material, also can reduce expense.And then among the present invention, owing to shortened the support stick size of plug, thus weight reduced, and obtained the effect that reduces expense.
Utilize Figure 19 and Figure 20 to be described further.The inner surface of sleeve pipe 431 can not adhere to foreign material, keep level and smooth.Silica tube is placed on the glass processing dish, at one end go up the quartzy system of welding supporting tube 432.
The present invention is to use the end of oxygen/hydrogen flame heating fusion sleeve pipe and supporting tube, and it is deposited that the fusion end is pushed against each other, and uses trowel that deposited part is carried out shaping, makes its external diameter and cover external diameter of pipe about equally.
That is, use the end of oxygen/hydrogen flame heating sleeve pipe and supporting tube, push two melted ends and carry out fusion and connect, preferably use trowel to carry out shaping, the external diameter that makes deposited part and pipe are about equally.
According to the present invention, when making optical fiber, fertile material is placed wire-drawing frame, during with its end fusion draw fiber yarn, can shorten from beginning spinning operation to stablizing the needed time and producing the length of bad fiber around here.
It is integrated that the present invention preferably makes optical fiber form with the end of fertile material in the process furnace of drawing wire machine, then its end drawn the beginning wire drawing.That is, among the present invention, make the sleeve pipe of plug and coating layer part separately.For the synthetic coating layer of paying quartzy system, plug is inserted in the sleeve pipe, use wire-drawing frame, the enforcement end is integrated before outlet.The expense that can obtain thus reduces.
The fertile material that the sleeve pipe hollow space is inserted with plug begins the wire drawing end, and preprocess becomes the ideal end shape, so wire drawing is easy to outlet.And, the shape of sleeve pipe hollow bulb and the end shape of plug are formed optimum shape, the bad phenomenon in the time of can suppressing to begin wire drawing.
Wire-drawing frame, arranged perpendicular have stove, resin applicator, resin solidification device, drawing wire machine.With glass fusion in stove, use the drawing wire machine continuous drawing.When wire drawing begins, need draw glass, fertile material is entered in the stove, heat up, make the end softening, stop to be subjected to gravity and to hang naturally.For this reason, starting end is preferably paid the shape of weight dwindling into cone shape end.
For example, embodiments of the present invention have been represented among Figure 21.Represented among Figure 21 that the end forms the plug 533 of taper and the sleeve pipe 531 of formation taper 535.And the end of having represented sleeve pipe 531 adds the lune part 539 of thermosetting.When the end of sleeve pipe 531 is formed cone-shaped the sealing, but when wire drawing outlet fast and stable, wire drawing is stable, and can reduce to the bad fiber when forming the high-quality fiber.
Sleeve pipe 531 heating is extended, and shrink, obtain extending cone-shaped simultaneously, preferably carry out the processing of closed operation and cone simultaneously.And, when plug 533 being processed into, to compare with the situation of not processing to shape that the end attenuates, the ratio of core and coating layer approaches the value of parallel portion, can make stability of characteristics quickly.
And then, the present invention relates to the core regulating method of optical fibre mother body material, it is characterized in that inserting optical fiber that the sleeve pipe of above-mentioned plug constitutes by plug and hollow space, to add thermosetting with the fertile material end integrated, then, to the gap between above-mentioned optical fibre mother body material and the insertion plug, on one side decompression, it is integrated to add thermosetting on one side, carry out wire drawing simultaneously, when making optical fiber, be provided with cone-shaped, above-mentioned telescopic end is attenuated, and the formation sealing, and, be provided with cone-shaped, the end of above-mentioned plug is attenuated, simultaneously, spacer is set, disposes above-mentioned sleeve pipe and above-mentioned plug with concentric(al) circles.
According to the present invention, when making optical fiber, make the centre portions that contains plug, and then use the sleeve pipe be equivalent to the coating layer part, it is integrated and when carrying out wire drawing simultaneously that they are added thermosetting, insert plug in the sleeve pipe after, the configuration of concentric circles ground can make the gained fiber reduce the core shift of plug.
According to the present invention, mandrel material inserted sleeve pipe after, transfer core, make plug be configured in the telescopic center, can guarantee good fiber size characteristic after the wire drawing.
Yet, in order to obtain the specific fibre characteristic, can be according to the index distribution characteristic of core, the ratio of regulation cover external diameter of pipe and internal diameter.Certainly the external diameter of plug is thinner than telescopic internal diameter.Therefore, during insertion, sleeve pipe and plug bend or when tilting, the fiber core core shift.
The wire-drawing frame of optical fiber vertically disposes stove, resin applicator, resin solidification device, drawing wire machine.With glass fusion in stove, use the drawing wire machine continuous drawing, because the wire-drawing frame arranged perpendicular, so fertile material also vertically inserts in the stove.For this reason, the plug of stationary state not in sleeve pipe stops to live in that the telescopic blind end is inboard.
Represented true mode example of the present invention among Figure 24.Figure 24 is illustrated in the ability real mode, the situation when inserting plug in the sleeve pipe.Figure 25 is a situation of having inserted plug.Being illustrated in the end in Figure 24, Figure 25 forms cone-shaped 636 plug 635 and forms cone-shaped 632 sleeve pipe 631.As above-mentioned, wire-drawing frame is an arranged perpendicular because fertile material also is vertically to insert in the stove, so sleeve pipe 631 in unfixed plug 635, the contact part 641 in the closed casing end forms and contacts.
Among the present invention, be provided with cone-shapedly 632 in the end of sleeve pipe 631, be provided with cone-shapedly 636 in the end of plug 635, in cone-shaped, sleeve pipe 631 forms in contact part 641 with plug 635 and contacts.Like this, the vertical central axis of plug 635 can be consistent with the vertical central axis of sleeve pipe 631.
For the upper end portion, use spacer, can make the vertical central axis of plug 635 is consistent with the vertical central axis of sleeve pipe 631.Use spacer, in the sleeve pipe 631 of length overall, can make plug 635 be positioned at the centre, the core shift of fiber core is minimum.
Among the present invention, be provided with cone-shapedly 632, the end of sleeve pipe 631 is attenuated and form sealing, and be provided with cone-shapedly 636, the end of plug 635 is attenuated, spacer is set simultaneously, make the cross-sectional shape of sleeve pipe 631 and plug 635 form concentric circles.That is, sleeve pipe 631 cylindraceous and columned plug 635, by making vertical central axis unanimity separately, the shape of cross section of sleeve pipe 631 and plug 635 can form concentric circles.By with the concentric circles configuration, can make the core shift of fiber core reach minimum.
Among the present invention, the opposed end that is provided with cone-shaped end at sleeve pipe 631 is provided with quartzy system supporting tube 633, at the opposed end that is provided with cone-shaped end of plug 635 quartzy system support stick 638 is set, and between supporting tube 633 and support stick 638 spacer is set.
Utilize Figure 25 to describe.Between plug 635 upper ends and sleeve pipe 631 upper ends, insert the wedge-like spacer, fix, central shaft is overlapped, and cross-sectional shape is disposed with concentric circles so that sleeve pipe is suitable for reading.Yet, only limit to the fertile material part, when wanting in fiber, to use, can supporting tube 633 be installed on sleeve pipe 631, support stick 638 is installed on plug 635, can make core form consistent being advisable.
In this case, sleeve pipe 631 and its supporting tube 633, and plug 635 and its support stick 638, central shaft separately needs unanimity.For this reason, among the present invention, disposing in interior week of the interior week of supporting tube 633 and sleeve pipe 631 with concentric circles, the periphery of the periphery of plug 635 and support stick 638 disposes with concentric circles, spacer is set, so that make the periphery of plug 635 or support stick 638,, form configuration with concentric(al) circles with respect to the interior week of supporting tube 633.
Among the present invention,, except support stick 638, on plug 635, be provided with greatlyyer,, form coaxial with support stick 638 with plug 635 external diameters support stick basic component 637 about equally than support stick 638 external diameters in order to fix spacer.Certainly, support stick basic component 637 is not set, support stick 638 is directly engaged with plug.Spacer is fixed on method on the support stick, can adopts the whole bag of tricks, for example, on support stick, be provided with cone-shaped, the opening portion of stationary partition.
Represented among Figure 26 that the spacer in the ability real mode inserts example.Spacer 651 is in supporting tube 633 inboards that are located on the sleeve pipe 631, by being located at the communicating pores on the spacer 651, the support stick 638 of plug 635 is inserted into the upper end of support stick basic component 637.Thus, can make sleeve pipe 631 consistent, and can dispose concentric circles with the vertical central axis of plug 635.
Represented used spacer example in the ability real mode among Figure 27.In order to make support stick pass through the centre of spacer 661, on spacer 661, be provided with and the support stick external diameter toroidal opening 663 of diameter about equally.In order to be inserted into the sleeve pipe inboard, spacer 661 is round-shaped, and the internal diameter of its external diameter and supporting tube about equally.The thickness of spacer 661 for example, in the ability real mode, is 10mm, but in fact, as long as can reach purpose of the present invention, thickness can arbitrarily be set, and is harmless.
In addition, during wire drawing, need be from sleeve pipe centre portions exhausted air, so need establish the hole.Shown in Figure 27 (a), Figure 27 (b), hole 665 is a plurality of toroidals holes, or a plurality of elliptical shapes hole, as long as can obtain desired hole area, to its shape etc., need not to adhere rigidly to.Owing to be exposed under the high temperature during wire drawing,, be preferably silica glass so require material to have good thermotolerance.
And then, the present invention relates to the working method of optical fibre mother body material end, it is integrated that the optical fiber that the sleeve pipe that it is characterized in that being inserted with this plug by plug and hollow space constitutes adds thermosetting with the fertile material end, then, to the gap between this plug and the sleeve pipe, decompression on one side Yi Bian form integratedly, is carried out wire drawing simultaneously, when making optical fiber, be provided with cone-shapedly, this telescopic end is attenuated, and form sealing.Be provided with cone-shapedly, the end of plug is attenuated, simultaneously, form with this plug end up to this cannula tip and contact, and the cone-shaped ratio that is located at this plug end is located at the cone-shaped more mitigation of this cannula tip.
Wire-drawing frame is vertically to be configured, so fertile material also is vertically to insert in the stove, unfixed plug 533 in sleeve pipe 531 leans on gravity can touch the bottom of sealed tube.Heat, make this part begin deposited after, carry out wire drawing.For this reason, among the present invention, as shown in figure 22, formed by contact part 537 with plug 533 ends up to sleeve pipe 531 ends and to contact, what be provided with on the plug end is cone-shaped, than being located at the cone-shaped 535 of sleeve pipe 531 ends, is provided with to such an extent that more relax and be advisable.Said herein cone-shaped, be to be illustrated between cone-shaped beginning and the termination, utilize straight line, easement curve, curve etc. that tapering is set.
When dwindling sleeve pipe so that the end can be more and more thinner, dwindle the end and form closure, when the end of plug also formed the apicule shape simultaneously, the ratio of core and coating layer was at pyramidal any part place, can both reach desired value, in the exit, when the end of plug touches the telescopic inwall, can in narrow scope, form contact, think that sleeve pipe also forms not so good closure sometimes when the beginning fusion.
Its result, the shape instability of fused interface, entrapped air pockets, or sleeve pipe fuses obliquely, core might take place depart from.Therefore, if processing plug end makes it to compare and have round property with managing inboard shape, when then inserting sleeve pipe, in very wide scope, and stably form in a circumferential direction and contact with inwall.Thus, before wire drawing begins, can implement to fuse operation at short notice, treat dimensionally stable after, carry out stable wire drawing again.
Represented the true mode example of another kind of the present invention among Figure 22.The expression end forms the plug 543 of approximate spherical cone and forms cone-shaped 545 sleeve pipe 541 among Figure 22.And in cannula tip, expression adds the lune part 549 of thermosetting.
In the ability real mode, contact with the end formation of plug 543 up to the end of sleeve pipe 541, the cone-shaped ratio that is located at plug end 547 is located at cone-shaped 545 of cannula tip and more relaxes.Therefore, as shown in figure 22, the plug end of being processed into, the shape than the hollow base of sleeve pipe 541 more has round property.Therefore, in the time of in inserting sleeve pipe 541, can be in very wide scope, and in a circumferential direction, obtain the contact part 547 stable with inwall.Thus, before wire drawing begins, can carry out stable fusion operation at short notice.
When the end shape of plug was similar to sphere, contact part was positioned at the beginning side near the sleeve pipe cone.Thus, form space shape between the bottom of the bottom of plug and sleeve pipe hollow bulb, when the outlet operation, need the time on the contrary.Therefore, preferably select optimum shape.
Embodiment
Followingly the present invention is described in further detail, but the invention is not restricted to these embodiment according to embodiment.
Utilize the VAD manufactured to contain the core fertile material of some coating layer herein, utilize silica tube further to pay the coating layer part, describe making the single-mode fiber situation.In the refractive index curve figure of other kinds, also can utilize other method for makings to make core.
(embodiment 1)
As shown in Figure 2, in the VAD method, use in the burner 21 by the core that multiple tubular construction forms, to gasify silicon tetrachloride and germanium tetrachloride and itch, hydrogen mixes and carries, after lighting, the reaction that is hydrolyzed in the flame that generates obtains the synthetic glass particulate, it is blown is attached on kind of the rod 24 formation porous matter core fertile material 23.In order to make stability of characteristics, at the similar coating layer burner 22 of the top of core burner 21 configuration, react equally with silicon tetrachloride and oxygen hydrogen, on the periphery of core cigarette ash, pay the coating layer part.Be heated again about 1500-1600 ℃, form transparent glass.In single-mode fiber, the size of core and coating layer ratio is about 1: 13.Being difficult to pay thick coating layer in the VAD operation, in the VAD glass that can make, is 1: 4.5.Can produce the vitreum that contains core like this.
With its stretching, be modulated into external diameter 30mm after, as follows, insert in the silica tube of the external diameter 90mm * internal diameter 33mm for preparing separately.
As the end polishing, as shown in Figure 3, will form the lap 32 of cutting knife with bortz powder, while rotate the end that is pressed against sleeve pipe 31, the end is ground the shape of making grinding tool 32.In order to prevent that working position is heated, implement water coolant 33 coolings simultaneously.Pipe 31 vertically is set,, slowly upwards presses grinding tool 32 from the bottom.At this moment, promise has the hole in the center of grinding tool 32, and mill slag and water coolant 33 are successfully flowed out, and has the few contaminated effect of the pipe of maintenance.
For the inside that penetrates rod, prepare the cone grinding tool, carry out equally.
As shown in Figure 4, be fixed on sleeve pipe 41 opposite ends of processing end in order to process rotating disk, welding upper support pipe 42 is blocked by rotating disk jig 45 on this part.Supporting tube 42 sides are connected with vacuum pump, can aspirate decompression inside.Draw side in 43 beginnings of plug of being processed into intended size and shape, support stick 44 is installed equally, utilize rotating disk jig 47 to be arranged on the rotating disk, and in the tubular stinger 41.Rotary turnplate, with oxygen and hydrogen flame calcination end, make pipe 41 and plug 43 fusions after, open the switch of pump, to inner pressure relief.When not having endways to begin to aspirate under the closed fully state, note the inner foreign material that suck, produce bubble.Subsequently, drive burner, make whole length form hypostazation.
That is, Fig. 7 a) shown in fertile material and sleeve pipe before the hypostazation, form Fig. 7 b) shown in integrated.
This entity is moved in the wire-drawing frame, use the electric furnace heating, when the end is softened, can utilize weight to stretch, use drawing wire machine that it is drawn and form 125 μ m, the coating ultraviolet curable resin forms fiber.Apply man-hour when the end is unreal, need spended time that external diameter is modulated into 125 μ m, and, the dimensional ratios of core and coating layer can not be formed set-point afterwards, need reach stable for a long time, but processing is implemented in the end of stipulating among the present invention, can shorten this time significantly.Though also depend on the size of fertile material, if the fertile material that uses in the present embodiment former, begins to need 2-3 hour to the lune dimensionally stable from wire drawing, according to the present invention, can shorten to 1 hour.
At the fiber that obtains with aforesaid method processing, produce phenomenon of rupture though exist.But when analyzing this breaking portion, detected metal powder.Think that this is the cause of having adhered to abrasive dust when grinding,, use pure water drip washing again, carry out drying afterwards so after grinding, clean with the 5wt% fluoric acid aqueous solution.When increasing this operation, can suppress to produce in the wire drawing fracture of wire phenomenon.Therefore, carrying out this matting among the present invention is best form.
Yet, utilizing pickling, the surface can produce coarse, and in pulling into the operation in thin footpath, the silk footpath also can change, and stops up coating die.For anti-phenomenon here, mechanical polishing is carried out in its end, can improve this bad phenomenon.Therefore, among the present invention, this polishing is best form.
(embodiment 2)
As Fig. 8 a) shown in, the same with embodiment 1, for be fixed on processing rotating disk on, processing the end sleeve pipe 82 opposite ends, deposited supporting tube 83 blocks this partial fixing.Become draw on the side 81 beginnings of plug of intended size and shape at preprocess, support stick 84 is installed equally, be arranged on the rotating disk, and in the tubular stinger 82.The same with embodiment 1, rotary turnplate.With oxygen and hydrogen flame calcination end, pipe 82 and plug 81 are fused together.Thus, as Fig. 8 b) shown in, just the incarnate plug in end makes up with pipe.It is moved in the wire-drawing frame, heat its end with electric furnace.And supporting tube 83 sides are connected with vacuum pump, open switch pump, reduced pressure in inside.Carry out hypostazation and drawing so simultaneously.Think that this method is the same with embodiment 1, have the effect of end processing.
(embodiment 3)
As shown in figure 29, in the method for embodiment 2, begin the end of a side in wire drawing, during with plug 81 and sleeve pipe 82 fusions, for straight pipe 82 internal diameters, it is very thin that the end of plug 81 becomes, so cone-shaped part of plug 81 and sleeve pipe 82, when producing deviation in the vertical, this part can produce very big gap, can not form good fusion sometimes.As shown in Figure 9, the inboard is ground to form pyramidal rod, as sleeve closure rod 95, be used for the end sealing, the cone-shaped part of plug 81 and sleeve pipe 82 is remained on roughly on the same position, in addition, with the embodiment 2 the same optical fiber fertile materials of making.The amplification sectional view of having represented the end closed state among Fig. 5.Improved the gap thus, construction drawing 9b) shown in end shape, after wire drawing began, slightly in Duan time (10-20 minute), this moment, fusion was finished in the end.Think and this method have 1 the same good end processing effect with embodiment.
(embodiment 4)
As shown in figure 10,, the sleeve pipe 102 of end processing is arranged on the glass processing rotating disk,, will manages 102 and slowly stretch to both sides with oxygen/hydrogen flame heating with embodiment 1 the same carrying out.Form the first quarter moon shape thus, and pipe attenuates.When blowing with flame at last, as Figure 10 b) shown in, the end sealing.Then, behind flame heating plug end, it is cone-shaped to draw formation.In excellent 101 tubular stingers 102, supporting tube 103 is installed in an opposite side of pipe 102.It is arranged in the wire-drawing frame.Slowly insert in the stove, the vacuum unit that supporting tube use to be installed makes the end fusion to inner pressure relief, and then the beginning wire drawing that stretches of this part, as Figure 10 c) shown in make stringy optical fiber 105.Later with wire drawing is the same usually, to stove in be pressed into vitreum on one side, draw fiber on one side, carry out hypostazation and fibrosis simultaneously.Think that this method also has the 1 the same good end processing effect with embodiment.
(embodiment 5)
As shown in figure 11, in the VAD method, in the core burner 205 that forms by multiple tubular construction, send into silicon tetrachloride (SiCl by gasification 4), germanium tetrachloride (GeCl 4), oxygen (O 2) and hydrogen (H 2) gas 209 that constitutes, ignition.The reaction that is hydrolyzed in flame obtains the synthetic glass particulate, it is blown be attached on kind of the rod 203, forms porous matter fertile material 201.To plant rod 203 and porous matter fertile material 201 and rotate half clock direction in the direction of arrows, the arrow that makes progress in the drawing is the direction that upwards draws.
In order to make the stability of characteristics of porous matter fertile material 201, dispose similar coating layer burner 207 on the top of core burner 205, send into by silicon tetrachloride (SiCl 4), oxygen (O 2) and hydrogen (H 2) gas 211 that constitutes, and react, on core sooty periphery, pay the coating layer part.This porous matter fertile material 201 is heated to about 1500-1600 ℃, forms transparent glass.In single-mode fiber, the size of core and coating layer ratio is 1: 13, but makes of the VAD method, is 1: 4.5.Then, this core fertile material is stretched, making external diameter is the plug of 30mm.
In addition, effective as cover, preparing internal diameter is the synthetic quartz pipe of 33mm.Plug is inserted in the sleeve pipe, form given ratio.For example, the expression centre has the plug 223 of core 221 and the profile instance of sleeve pipe 225 among Figure 12.
The numerical value shown in the arrow is size ratio separately among Figure 12, and core segment 221 external diameters of plug are taken as at 1 o'clock, and the external diameter of plug 223 is 4.5.The external diameter that core 209 external diameters of plug is taken as 1 o'clock sleeve pipe 225 is 13.
Yet the hollow space of sleeve pipe inboard does not adhere to foreign material, is keeping level and smooth.Sleeve pipe is placed on the glass processing rotating disk,, both sides are slowly stretched with oxygen/hydrogen flame heating.Thus, form lune because of fusion is softening, pipe attenuates.Blow with flame at last, the end can be sealed.
As shown in figure 13, with the side that sleeve pipe 231 ends that so obtain are not sealed, quartzy system supporting tube 233 in the fusion.The external diameter of supporting tube 233 is about 90mm, and internal diameter is about 70mm, behind the jacket cooling, takes off from rotating disk, with the opening portion of supporting tube 233, clogs with the stopper 219 of silicon rubber system.
Shown in Figure 14 (a), supporting tube 233 opening parts were flooded 3 hours in the groove 243 that fills with 10wt% hydrofluoric acid aqueous solution 241 with the sleeve pipe 231 that stopper 235 clogs.Then shown in Figure 14 (b), transfer to again in the groove 247 that pure water 245 is housed, slightly wash.At last, shown in Figure 14 (c), use pure water shower nozzle 249 to carry out drip washing, blow away water droplet with pressurized air after, carry out air-dry.
And then, as shown in figure 15, on plug 251 1 ends that are processed into intended size, install material and be the natural stone English system, external diameter is about 25mm, and length is about the support stick 253 of 300mm.Support stick 253 with plug 251 is fixed on the rotating disk that can make vertically-acting with jig 255.The supporting tube 233 usefulness jigs 257 of sleeve pipe 231 are fixed.Like this, press the direction of arrow among Figure 15, slowly fall plug 251, and insert in the opening of sleeve pipe 231.
Then, as shown in figure 16, the sleeve pipe 231 that is inserted with plug 251 being taken off from rotating disk, in the insertion end of supporting tube 233, is that pyramidal silicon rubber system lid 259 covers with profile.Then, as mentioned above, dipping is 3 hours in the 10wt% hydrofluoric acid aqueous solution.Then transfer in the groove that pure water is housed, slightly wash, last, use the pure water shower nozzle to carry out drip washing, and after blowing away the water merchant with pressurized air, carry out air-dry.
Then, in the supporting tube that the is inserted with plug 251 233 upper tube portions of so preparing vacuum unit is installed.Aspirate,, and be arranged on the wire-drawing frame so that to inner pressure relief.Slowly insert in the stove, heated end portion forms fusion, and then this part is stretched, and the beginning wire drawing.After, the same with common wire drawing, on one side fertile material is pressed into, during the drawing optical fiber of one side, carry out hypostazation and fiberize simultaneously.
Use drawing wire machine, synthetic optical fiber like this is carried out wire drawing with fertile material, make the external diameter of glass part be about 125 μ m, then, the coating ultraviolet curable resin, irradiation ultraviolet radiation solidifies it, obtains the optical fiber that external diameter is about 250 μ m.So carry out wire-drawing process, the result can not rupture in the wire drawing, can not produce bad silk footpath yet, can implement good wire drawing.
The pure water that uses in matting is to utilize ion exchange method to carry out purified, and specific conductivity remains on the following refining pure water of 1 μ A.In addition, the pure water that uses specific conductivity to surpass 1 μ A carries out matting, but can not rupture in the wire drawing this moment, and the silk footpath changes incidence and rises to 0.05 time/km.This is that (0.001-0.005 time/km) 10-50 doubly, the purity of pure water preferably is controlled at specific conductivity below the 1 μ A common level as can be known.
(embodiment 6)
The same with embodiment 5, make the core fertile material with the VAD legal system, this fertile material is drawn, making external diameter is the plug of 30mm.
The same with embodiment 5, in addition as sleeve pipe, the preparation external diameter is 90mm, and internal diameter is the synthetic quartz pipe of 33mm, and plug is inserted in the silica tube.Expression plug and telescopic profile instance among Figure 12.
Among Figure 12 in the arrow shown in numeral size ratio separately, the external diameter that is equivalent to the core segment of plug is 1, plug is of a size of 4.5.The external diameter that is equivalent to the core segment of plug is 1, and sleeve pipe is 13.
The same with embodiment 5, the sketch when expression is inserted plug in the sleeve pipe among Figure 15.The sleeve pipe inner surface does not adhere to foreign material, and is keeping level and smooth.Sleeve pipe is placed on the glass processing rotating disk, with oxygen/hydrogen flame heating, seal an end, the quartzy system of welding supporting tube on closed side not.After the cooling, it is taken off from rotating disk.
With oxygen/hydrogen flame heating, and the extruding two ends fuse connection with the end of above-mentioned sleeve pipe and supporting tube, to the inboard of fused portion, are shaped into trowel and equal the telescopic internal diameter.
Then, the same with embodiment 5, the VAD plug that is processed into intended size is arranged on the rotating disk, with oxygen/hydrogen flame heating, quartzy system support stick after the cooling, takes off in the welding.
Sleeve pipe and plug are arranged on the insertion rotating disk of vertical drive, implement the insertion operation in sleeve pipe.The support stick of plug and telescopic supporting tube are fixed with jig.Like this, slowly fall plug, insert in the telescopic hollow space by the direction of arrow among Figure 15.
As shown in figure 16, the sleeve pipe 231 that is inserted with plug 251 is taken off from rotating disk, at the insertion end cover lid 259 of supporting tube 233.Then, as above-mentioned, in hydrofluoric acid aqueous solution, flood.Then transfer in the groove that pure water is housed, slightly wash, last, carry out drip washing with the pure water shower nozzle, blow away water droplet with pressurized air again after, carry out air-dry.
Figure 17 has represented the state in the plug 335 insertion sleeve pipes 331.In the present embodiment and since used external diameter as the plug of 30mm and internal diameter as the sleeve pipe of 33mm, so the difference in size of plug external diameter 341 and casing inner diameter 343 is 3.0mm, fully guaranteed more than the 1.0mm.
Then, vacuum unit is installed,, and is placed wire-drawing frame so that to the internal suction decompression in the supporting tube upper tube portion that is inserted with plug of so preparing.Slowly insert in the stove, heated end portion fuses, and then this part that stretches, the beginning wire drawing.Later with common wire drawing is the same, Yi Bian vitreum is pressed in the stove, Yi Bian draw fiber, and carry out hypostazation and fibrosis simultaneously.Use drawing wire machine to draw, form the fiber of 125 μ m, and the coating ultraviolet curable resin, coating obtains 250 μ m diameters.
(embodiment 7)
The same with embodiment 5, make plug, like this, prepare silica tube.
Sketch when expression is inserted plug in the sleeve pipe according to the present invention among Figure 19.The inner surface of sleeve pipe 431 does not adhere to foreign material, is keeping level and smooth.Sleeve pipe is arranged on the glass processing rotating disk, and the welding external diameter is that 90mm, internal diameter are the quartz system supporting tube of 70mm on the end.After the cooling, it is taken off from rotating disk.
With the end of above-mentioned sleeve pipe and supporting tube, with oxygen/hydrogen flame heating, and the extruding two ends carry out fusion and connect, and then use the trowel shaping, the external diameter that makes weld with manage about equally.
The VAD plug 35 that then will be processed into intended size places on the rotating disk, and with oxygen/hydrogen flame heating, quartzy system support stick 36 takes off after the cooling in the welding.The material of support stick 36 is a natural quartz, and size is that external diameter is 25mm, and length is 300mm.
Then, sleeve pipe 431 and plug 435 are arranged on the insertion rotating disk of vertical drive, implement insertion operation to sleeve pipe 431.Be fixed on the rotating disk with the support stick 436 of jig 437 plug 435.And fix the supporting tube 432 of sleeve pipe 431 with jig 433.Like this, according to the direction of arrow among Figure 19, slowly fall plug 435, and be inserted in the hollow space of sleeve pipe 431.
Represented among Figure 20 plug is inserted state in the sleeve pipe.
Then, vacuum unit is installed, is aspirated,, and place in the wire-drawing frame inner pressure relief in the supporting tube upper tube portion that is inserted with plug of so preparing.To the internal suction decompression, Yi Bian slowly insert in the stove, heated end portion fuses, and then this part that stretches on one side, and the beginning wire drawing.
Later with common wire drawing is the same, Yi Bian vitreum is pressed in the stove, Yi Bian draw fiber, and carry out hypostazation and fibrosis simultaneously.The use drawing wire machine stretches, and is drawn into the fiber yarn that the glass external diameter is 125 μ m, the coating ultraviolet curable resin, and irradiation ultraviolet radiation is cured, and coating forms the diameter of about 250 μ m.
(embodiment 8)
The same with embodiment 5, make plug, like this, prepare silica tube.
Sleeve pipe is arranged on the glass processing rotating disk,, slowly stretches to both sides with oxygen/hydrogen flame heating.Form the first quarter moon shape thus, and sleeve pipe attenuates.When blowing with flame at last, finish closed end.Then with behind the flame heating plug end, it is cone-shaped to draw formation.
Represented among Figure 21 plug is inserted state in the sleeve pipe.Among Figure 21, telescopic conical part length is 120mm.The conical part length of plug is 40mm.Opposition side at closed casing is installed supporting tube (not shown), and is placed in the wire-drawing frame.Slowly insert in the stove, make the district that reaches a high temperature, end,, and carry out hypostazation, fused portion is stretched the end fusion, and the beginning wire drawing.
Then, use the vacuum unit that supporting tube is installed to be reduced pressure in inside, and carry out hypostazation.The same with common wire drawing, Yi Bian vitreum is pressed in the stove, Yi Bian draw fiber, and carry out hypostazation and fibrosis simultaneously.Use drawing wire machine to stretch, forming the glass external diameter is the fiber of 125 μ m, the coating ultraviolet curable resin, and irradiation ultraviolet radiation solidifies, to form the diameter of 250 μ m.
(embodiment 9)
The same with embodiment 8, as shown in Figure 22, the rod end is implemented to be processed to form round shape.This plug is inserted in sleeve pipe, equally with embodiment 8 carry out wire drawing.As a result, compare with embodiment 8, more quickly with the sleeve pipe fusion, the beginning wire drawing.And then external diameter is adjusted to 125 μ m, also finish at short notice, and the dimensional ratios of core and coating layer also reaches set-point, and shorten the stable time that arrives significantly.
(embodiment 10)
The same with embodiment 5, make plug, like this, prepare silica tube.
Represented the sketch the when plug that will extend inserts in the sleeve pipe among Figure 24.The telescopic inner surface does not adhere to foreign material, keeps level and smooth.Sleeve pipe is placed on the glass processing rotating disk, and at one end going up the welding external diameter is that 90mm, internal diameter are the quartz system supporting tube of 70mm.After the cooling, it is taken off from rotating disk.
The plug that then will be processed into intended size places on the rotating disk, and with oxygen/hydrogen flame heating, stretches.Be that the support stick basic component of 30mm, the quartzy system of the long 300mm of being and the external diameter that is located at support stick basic component upside are 25mm in advance with external diameter, length connects for the quartz system support stick of 300mm.Like this, this support stick basic component is cut off, it is thick to form 20mm, directly fuses with the upper end of plug.After the cooling, take off from rotating disk.
Then, it is arranged on the rotating disk of vertical drive with sleeve pipe with core, implements to insert operation.Use jig to fix sleeve pipe, use the plug of jig equally, slowly fall, insert (with reference to Figure 24) with the support stick partial fixing with supporting tube.Then, confirm that the lower end of plug is in the sleeve pipe center, and accurately contact (with reference to Figure 25) with sleeve pipe.
Then, as shown in figure 26, take off jig used when inserting plug 635.From the opening portion of supporting tube 633 inboards, inserting on support stick 638 and being provided with external diameter is 69.5mm, and thickness is 10mm, and diameter is the discoid spacer 651 of 25.5mm opening, and when crashing into and the inboard of supporting tube 633 forms chimeric.That is, wire drawing begins side, and the end of sleeve pipe 636 (becoming 635 among the figure) is touched mutually with the end of plug, transfers core, and wire drawing finishes side, transfers core by spacer, and on the whole length of fertile material, configuration sleeve pipe and plug form concentric circles.Represented representational discoid shape used among the embodiment among Figure 27.
On the sleeve pipe upper support tube portion of as above preparing that is inserted with plug, vacuum unit is installed, and is aspirated,, and be arranged in the anchoring inner pressure relief.Slowly insert in the stove, heated end portion fuses, and then this part that stretches begins wire drawing.Later on the same with common wire drawing, on one side fertile material is pressed in the stove, one side draws fiber, and carry out inner pressure relief simultaneously, hypostazation and fibrosis.
Stretch with drawing wire machine, forming the glass part external diameter is the fiber yarn of 125 μ m, is coated with ultraviolet curable resin, makes external diameter form 250 μ m, obtains the plain silk of optical fiber.It is long that the gained fiber is cut into every 2km, measures whether core shift of plug.The departure at coating layer center and plug center all below 0.2 μ m, presents good result as a result.Do not think in the wire-drawing process that the generation bubble is not thought in the change of fiber external diameter yet.
The manufacture method of putting down in writing among the present invention, for example, among the embodiment 10, for sleeve pipe, use OH base concentration below 100ppm, preferably the optical fiber measurement made of the following formed silica tube of synthetic quartz of 1ppm in the 1385nm wavelength transmission loss (OH absorption loss) time, obtain the following value of 0.4dB/km.More specifically saying, is in the scope of 0.29-0.38dB/km, and this fiber in the WDM transmission system of using wide wavelength band territory, has fabulous transmission loss characteristic.
Industrial applicability
Optical fiber fertile material manufacture method according to the present invention is owing to when synthetic fertile material, transfer The end of whole fertile material forms desired shape, so the fertile material that processes can directly send Toward wire-drawing process, be accompanied by the processing operation to the fertile material end after synthesizing, can suppress bad phenomenon Take place and the expense increase. And then the optical fiber fertile material that uses the present invention to make is at drawing optical fiber During silk, shortened from the beginning wire-drawing operation and decreased to the length that produces bad fiber stationary phase and time Lose, can make expeditiously optical fiber.
According to the present invention, because it is contaminated to adjust inside pipe casing, the fertile material surface cleaning, So when in wire-drawing process, making fertile material form optical fiber, can reduce fibercuts and string diameter variation etc. Bad phenomenon takes place.
And then, arrange cone-shapedly, so that the end of sleeve pipe attenuates, and sealing, arrange cone-shapedly, make The end of plug attenuates, and by spacer is set, makes the cross sectional shape of sleeve pipe and plug, with one heart The configuration of circle shape, the departure at clad center and plug center all reaches below the 0.2 μ m, can get To the minimum fiber of plug core shift. And do not think in wire-drawing process, fiber external diameter meeting change, Do not think yet and to produce bubble.

Claims (18)

1. an optical fiber manufacturing method is characterized in that, comprises at least: form the operation that contains the core glass body; Constitute the preparatory process of the Glass tubing of coating layer part; The operation that above-mentioned glass tube exterior surface is cleaned; Operation in inserting above-mentioned vitreum in the Glass tubing; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting.
2. methods for optical fiber manufacture according to claim 1 is characterized in that, also comprises: the operation that the tensile side end of above-mentioned Glass tubing is sealed; With the operation of supporting tube being installed in the end side of above-mentioned Glass tubing, the operation that above-mentioned glass tube exterior surface is cleaned be insert above-mentioned vitreum in the above-mentioned Glass tubing after, clog the operation of cleaning behind the above-mentioned supporting tube with stopper.
3. an optical fiber manufacturing method is characterized in that, comprises following operation at least: form the operation that contains the core glass body; Constitute the preparatory process of coating layer segment glass pipe; First matting that above-mentioned glass tube exterior surface is cleaned; After above-mentioned first cleaning, cover the operation of above-mentioned glass tube exterior surface with packing film; With behind the packing film covering process, above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; After the above-mentioned insertion operation, the operation of removing above-mentioned packing film; After removing above-mentioned packing film, clog the open portion of above-mentioned Glass tubing, second matting that above-mentioned glass tube exterior surface is cleaned with stopper; And above-mentioned vitreum and Glass tubing added the incorporate operation of thermosetting.
4. according to the described methods for optical fiber manufacture of claim 1～3, it is characterized in that above-mentioned matting is to use the hydrofluoric acid aqueous solution of 1～20wt%, after handling with above-mentioned hydrofluoric acid aqueous solution, use pure water drip washing again, drying.
5. optical fiber manufacturing method according to claim 4 is characterized in that, above-mentioned matting comprises the operation of using the pure water of specific conductivity below 1 μ A to carry out drip washing.
6. an optical fiber manufacturing method is characterized in that,, comprise at least: form the operation that contains the core glass body; Constitute the preparatory process of coating layer segment glass pipe; To the tensile side end of above-mentioned Glass tubing, be provided with on the inner face at least cone-shaped, and the operation of sealing; Operation in inserting above-mentioned vitreum in the Glass tubing; To the gap between the internal diameter of above-mentioned Vitrea external diameter and Glass tubing, roughly form the operation that spacer is set consistently in the vertical; With above-mentioned vitreum and Glass tubing are added the incorporate operation of thermosetting.
7. optical fiber manufacturing method according to claim 6 is characterized in that, also comprises: with the end of the opposite side of above-mentioned Glass tubing tensile side on, the operation that supporting tube is installed; With on the end of the opposite side of above-mentioned Glass tubing tensile side, the operation of support stick is installed, wherein between the internal diameter of the external diameter of above-mentioned support stick and above-mentioned supporting tube, in the gap above-mentioned spacer is set.
8. optical fiber manufacturing method according to claim 6, it is characterized in that, tensile side, make above-mentioned Vitrea end touch cone-shaped that is located at the Glass tubing inner face, transfer core, a side opposite with tensile side uses above-mentioned spacer to transfer core, and above-mentioned vitreum and above-mentioned Glass tubing are configured with forming concentric circles.
9. optical fiber manufacturing method according to claim 6 is characterized in that, after the operation in inserting above-mentioned vitreum in the Glass tubing, the operation of above-mentioned spacer is set.
10. optical fiber manufacturing method according to claim 6 is characterized in that, also is included on the opposite side end of above-mentioned Vitrea tensile side, and the operation of support stick is installed with concentric circles; With on the opposite side end of tensile side of above-mentioned Glass tubing, the operation of supporting tube is installed with concentric circles.
11. optical fiber manufacturing method according to claim 6 is characterized in that, also comprises: on the opposite side end of above-mentioned Vitrea tensile side, the operation of support stick is installed with concentric circles; With on the opposite side end of tensile side of above-mentioned Glass tubing, with the operation that concentric(al) circles is installed supporting tube, above-mentioned support stick has the fixed part for fixing above-mentioned spacer.
12. optical fiber manufacturing method according to claim 6 is characterized in that, the material of above-mentioned spacer is a silica glass.
13. optical fiber manufacturing method according to claim 6, it is characterized in that, the profile of above-mentioned spacer is circular, can form chimeric with the internal diameter of above-mentioned Glass tubing, the center has can insert above-mentioned Vitrea opening portion, also have gas discharge hole,, can reduce pressure the space between above-mentioned Glass tubing and the above-mentioned vitreum so that when wire drawing.
14. optical fiber manufacturing method according to claim 6, it is characterized in that, the profile of above-mentioned spacer is circular, can form chimeric with the internal diameter of above-mentioned Glass tubing, the center has can insert above-mentioned Vitrea opening portion, around above-mentioned opening portion, have several slit-shaped venting holes,, can reduce pressure the space between above-mentioned Glass tubing and the above-mentioned vitreum so that when wire drawing with radial setting.
15. optical fiber manufacturing method according to claim 6, it is characterized in that, the profile of above-mentioned spacer is circular, can form chimeric with the internal diameter of above-mentioned Glass tubing, the center has can insert above-mentioned Vitrea opening portion, and have the venting hole that forms by a plurality of apertures, so that when wire drawing, can reduce pressure to the space between above-mentioned Glass tubing and the above-mentioned vitreum.
16. optical fiber manufacturing method according to claim 6, it is characterized in that, also comprise: the operation of cone shape is processed in above-mentioned Vitrea tensile side end, wherein is located at cone-shaped more precipitous than above-mentioned Glass tubing inner face of cone on the above-mentioned vitreum.
17. an optical fiber manufacturing method is characterized in that, comprises at least: form the operation that contains the core glass body; Constitute the preparatory process of the Glass tubing of coating layer part; Be processed into the operation of cone shape to the tensile side end of the above-mentioned Glass tubing of major general; Above-mentioned vitreum is inserted operation in the above-mentioned Glass tubing; Above-mentioned vitreum and Glass tubing are added the integrated operation of thermosetting, and wherein the transmission loss in the optical fiber of manufacturing of 1385nm wavelength is 0.4dB/km, or below it.
18. optical fiber manufacturing method according to claim 17 is characterized in that, above-mentioned Glass tubing is formed by the synthetic quartz of OH base concentration below 100ppm.
CN 200710142414 2002-05-09 2003-05-08 Method of manufacturing optical fiber Expired - Fee Related CN101125733B (en)

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JP2002199163A JP4297320B2 (en) 2002-07-08 2002-07-08 Cleaning method for optical fiber preform
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JP4728605B2 (en) * 2004-07-13 2011-07-20 古河電気工業株式会社 Optical fiber preform and manufacturing method thereof
DE102004039645B3 (en) * 2004-08-14 2006-01-05 Heraeus Tenevo Ag Method for producing an optical component made of quartz glass as well as suitable precursor for carrying out the method
JP4712359B2 (en) * 2004-11-29 2011-06-29 古河電気工業株式会社 Optical fiber manufacturing method
US8789393B2 (en) 2004-11-29 2014-07-29 The Furukawa Electric Co., Ltd. Optical fiber preform, method of manufacturing optical fiber preform, and method of manufacturing optical fiber
JP5276037B2 (en) * 2010-03-26 2013-08-28 古河電気工業株式会社 Optical fiber preform and manufacturing method thereof
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EP3243803B1 (en) 2015-01-09 2020-03-04 Furukawa Electric Co., Ltd. Glass optical fiber preform and method of manufacturing optical fiber
JP2017154931A (en) * 2016-03-02 2017-09-07 住友電気工業株式会社 Method for manufacturing optical fiber
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CN107952877A (en) * 2017-10-19 2018-04-24 宁波涵盛智能科技有限公司 A kind of continuous stamping die and process for stamping of optical fiber crimping set

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